Error: key "ghc" not found

Copied from: https://github.com/haskell/ghcup-hs/issues/1110

Any ghcup command I run, including ghcup upgrade or ghcup tui, shows the following output:

[ Info  ] downloading: https://ghc.gitlab.haskell.org/ghcup-metadata/ghcup-nightlies-0.0.7.yaml as file /Users/bchinn/.ghcup/cache/ghcup-nightlies-0.0.7.yaml
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  606k  100  606k    0     0   964k      0 --:--:-- --:--:-- --:--:--  963k
[ Error ] [GHCup-00160] JSON decoding failed with: Aeson exception:
[ ...   ] Error in $: key "ghc" not found
[ ...   ] Consider removing /Users/bchinn/.ghcup/cache/ghcup-nightlies-0.0.7.yaml manually.

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